No, this isn't true, prototypes are not needed for recursive subroutine calls.The typical example of recursive routines is the calculation of the factorial of a number, which may be coded this way:
#!/usr/bin/perl
use strict;
use warnings;
my $input = shift;
chomp $input;
print factorial($input);
sub factorial {
my $val = shift;
return 1 if $val == 0 or $val == 1;
return $val * factorial($val - 1);
}
As you can see, no prototype needed. Prototypes can be useful for some advanced constructs, but, as a beginner, just don't use them, at least until you are no longer a beginner and you really know what they are and what they really do.
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